30" Channel Balances 2920 / 29BSI

A quick learner says:
Hi Swisco,

These are 30" channel balances (metal only length) Two different brands or channel balances were installed in the same window. Can you recommend a replacement? I saw 349, 350, 380 looked all vaguely similar. Here are some photos that may help:l.

Thank you

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A quick learner says:
More photos:
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Profile picture of Bob
Bob from SWISCO responded:

Does the top nylon fitting lack wings (or tabs on the sides), like our 19-002 ? If so, see either the S351-30 or S390-30 . The only difference between these two balances is the bottom nylon shoe depth, so compare both with your old hardware to see what matches best. You'll need a stamp option of 2920. If you need new Top Sash Guides also, see the 18-008H

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